TextField 方法

鍵盤的問題，請使用第三方解決，高效，牛X!

1.讓textField只能輸入數(shù)字

```

#define NUMBERS @"0123456789\n"

-(BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string{

NSCharacterSet*cs;

if(textField ==self.accNo|| textField ==self.numberText)

{

? ? ? ? cs = [[NSCharacterSetcharacterSetWithCharactersInString:NUMBERS]invertedSet];

? ? ? ? NSString*filtered = [[stringcomponentsSeparatedByCharactersInSet:cs]componentsJoinedByString:@""];

? ? ? ? BOOLbasicTest = [stringisEqualToString:filtered];

? ? ? ? if(!basicTest)

? ? ? ? ? ?{

? ? ? ? ? ? ? ?UIAlertView* alert = [[UIAlertViewalloc]initWithTitle:@"提示"

? ? ? ? ? ? ?message:@"請輸入數(shù)字"

? ? ? ? ? ? ?delegate:nil

? ? ? ? ? ? ?cancelButtonTitle:@"確定"

? ? ? ? ? ? ?otherButtonTitles:nil];

? ? ? ? ? ? ?[alertshow];

? ? ? ? ? ?returnNO;

? ? ? ? ? ? }

}

? ? ? returnYES; ?

}

```

2. 通知的來監(jiān)聽[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(textFieldChange)name:UITextViewTextDidChangeNotificationobject:nil];

3.textfield加一個刪除按鈕

UIView*rightVeiw = [[UIViewalloc]initWithFrame:CGRectMake(0, searIV.frame.size.height/2-10,30,20)];

UIImageView* xImageView = [[UIImageViewalloc]initWithImage:[UIImageimageNamed:@"ic_delete-0"]];

xImageView.frame=CGRectMake(10,3,14,14);

xImageView.userInteractionEnabled=YES;

[rightVeiwaddSubview:xImageView];

searchTF.rightView= rightVeiw;

searchTF.rightViewMode=UITextFieldViewModeWhileEditing;

UITapGestureRecognizer*xImageViewTap = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(xImageViewClick:)];

[xImageViewaddGestureRecognizer:xImageViewTap];

4.這個方法也可以拿到變化的textField后的值

[_titleTextFieldaddTarget:selfaction:@selector(valueChanted:)forControlEvents:UIControlEventAllEditingEvents];